class_docstr: Interface for receiving logical document content events.
  
  This is the main callback interface in SAX, and the one most
  important to applications. The order of events in this interface
  mirrors the order of the information in the document.
docstr: Receive notification of the beginning of a document.
  
  The SAX parser will invoke this method only once, before any
  other methods in this interface or in DTDHandler (except for
  setDocumentLocator).
docstr_tok: ["Receive","notification","of","the","beginning","of","a","document",".","The","SAX","parser","will","invoke","this","method","only","once",",","before","any","other","methods","in","this","interface","or","in","DTDHandler","(","except","for","setDocumentLocator",")","."]
code: def startDocument(self):
      """Receive notification of the beginning of a document.
  
      The SAX parser will invoke this method only once, before any
      other methods in this interface or in DTDHandler (except for
      setDocumentLocator)."""
  
label_desc: Use image node_id 3 for calling the ContentHandler obj's underlying member method code with example usage: obj.startDocument() without return types